Define Christian. Are we talking unity or trinity?
There's various branches of Christianity and Islam is effectively one of those, which is why your argument about if 'they' dont like our christian country they can leave a little ridiculous, when you actually start looking deeply into the facts rather than spouting bigoted rhetoric (in my personal opinion of course). Just because it's packaged differently doesn't ultimately make it different. It's an additional set of rules as to how one should lead ones life, over and above those defined in the country of residence.
All religions have people taking advantage of others, whether it's taking money (US tv preachers, or cofe churches paying significant sums to the diocese , putting the believers up against the authorities (wako?), Islam isn't any different to any other religion, which is where the underlying laws of the country take over and they get treated as the Criminals they are.
As for laws changing, yes they do, frequently to reflect the changing world, part of which is the mix of the population. As citizens you get the right to vote, to take part in the democracy, to elect the people you want to make those laws for you and to boot them out of power when you feel they haven't done a good job. Ultimately if you don't like the way the country is run then you have two real options to do something about it. Work within the system to change it, get involved in politics, or leave the country for somewhere you feel is better. Moaning on a small internet forum doesn't change anything.
P.S. Tony Bliar as a christian took us into an illegal war by lying to us, but has justified it with his beliefs